//
// Thread_POSIX.h
//
// $Id: //poco/1.4/Foundation/include/Poco/Thread_POSIX.h#3 $
//
// Library: Foundation
// Package: Threading
// Module:  Thread
//
// Definition of the ThreadImpl class for POSIX Threads.
//
// Copyright (c) 2004-2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_Thread_POSIX_INCLUDED
#define Foundation_Thread_POSIX_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Runnable.h"
#include "Poco/SignalHandler.h"
#include "Poco/Event.h"
#include "Poco/RefCountedObject.h"
#include "Poco/ThreadPriority.h"

#include <pthread.h>
// must be limits.h (not <climits>) for PTHREAD_STACK_MIN on Solaris
#include <limits.h>
#if !defined(POCO_NO_SYS_SELECT_H)
#include <sys/select.h>
#endif
#include <errno.h>
#include <memory>


namespace Poco {

enum ThreadPolicyIMPL
{
	POLICY_DEFAULT_IMPL = SCHED_OTHER
};

class Foundation_API ThreadImpl
{
public:	
	typedef pthread_t TIDImpl;
	typedef void (*Callable)(void*);

	ThreadImpl();
	~ThreadImpl();

	TIDImpl tidImpl() const;
	void setPriorityImpl(int prio);
	int getPriorityImpl() const;
	void setOSPriorityImpl(int prio, int policy = SCHED_OTHER);
	int getOSPriorityImpl() const;
	static int getMinOSPriorityImpl(int policy);
	static int getMaxOSPriorityImpl(int policy);
	void setStackSizeImpl(int size);
	int getStackSizeImpl() const;
	void startImpl(Runnable& target);
	void joinImpl();
	bool joinImpl(long milliseconds);
	bool isRunningImpl() const;
	static void sleepImpl(long milliseconds);
	static void yieldImpl();
	//static ThreadImpl* currentImpl();
	static TIDImpl currentTidImpl();

protected:
	static void* runnableEntry(void* pThread);
	static int mapPrio(int prio, int policy = SCHED_OTHER);
	static int reverseMapPrio(int osPrio, int policy = SCHED_OTHER);

private:
	struct ThreadData
	{
		ThreadData():
			pRunnableTarget(0),
			thread(0),
			prio(PRIO_NORMAL),
			policy(SCHED_OTHER),
			done(false),
			stackSize(POCO_THREAD_STACK_SIZE),
			started(false),
			joined(false)
		{
		}

		Runnable* 	  pRunnableTarget;
		pthread_t     thread;
		int           prio;
		int           osPrio;
		int           policy;
		Event         done;
		std::size_t   stackSize;
		bool          started;
		bool          joined;
	};

	ThreadData 			m_threadData;
};


//
// inlines
//
inline int ThreadImpl::getPriorityImpl() const
{
	return m_threadData.prio;
}


inline int ThreadImpl::getOSPriorityImpl() const
{
	return m_threadData.osPrio;
}


inline bool ThreadImpl::isRunningImpl() const
{
	return !(m_threadData.pRunnableTarget == nullptr);
}


inline void ThreadImpl::yieldImpl()
{
	sched_yield();
}


inline int ThreadImpl::getStackSizeImpl() const
{
	return static_cast<int>(m_threadData.stackSize);
}


inline ThreadImpl::TIDImpl ThreadImpl::tidImpl() const
{
	return m_threadData.thread;
}


} // namespace Poco


#endif // Foundation_Thread_POSIX_INCLUDED
